vsftpd: Change method for using custom vsftpd-conf(ig) package
vsftpd: Change method for using custom vsftpd-conf(ig) package

Instead of using a USE flag (vsftpd_config) for selecting vsftpd-conf
package, use the normal OE-lite mechanism for selecting the provider
of vsftpd-config (notice: new name, to avoid confusion).

This commit by itself, is not backwards compatible. This needs to be fixed
before release of 3.2.0.

Signed-off-by: Esben Haabendal <esben.haabendal@prevas.dk>

(cherry picked from commit b6f0dd7e990e4fff642704c8da33359bbd692cf1)

jacobbarsoe/rpi-base,jacobbarsoe/rpi-base,oe-lite-rpi/base,oe-lite-rpi/base